Linux 3.2 has been released [like 34 weeks ago, sorry for the delay]. The changes include support for Ext4 block sizes bigger than 4KB and up to 1MB, btrfs has been updated with faster scrubbing, automatic backup of critical filesystem metadata, detailed corruption messages and tools for manual inspection of the metadata; the process scheduler has added support to set upper limits of CPU time usage to groups of processes; the desktop reponsiveness in presence of heavy writes has been improved; TCP has been updated to include an algorithm which speeds up slightly the recovery of connection after lost packets; and more. New drivers and small improvements and fixes are also available in this release. Here's the full changelog.